Anyone know the difference?
What is more appropriate for self defense?

I cannot believe the ballistics achieved from this ammo manufacturer in the Czech Republic-Sellier & Bellot.
Ive shot their 7.62 x 39 & 9x19 (9mm) ammo and it is excellent, if just a touch 'dirtier' than others-Warehouse/Storage??.

That said, Id like to order more 9mm and wondering if a SP is preferred or comparable, over the JHP for use against human targets where penetration & Expansion is a necessity.

I shoot a Sig 9mm & use Speer ammo, which I consider to be excellent, but Ive seen 30% more Energy with S & B, almost 600 FPE, 357 magnum territory.

This is unquestionably the world's most popular pistol round. For this reason it has been the subject of a lot of experimentation, because 9mm ball - used by every army in the Western world - is a mediocre manstopper. Jacketed hollowpoints are a must if one wishes to rely on the 9mm as a defense round. Use ball ammo for practice only.

9mm ammunition is available in two pressure levels: standard and "+P." The latter should only be used in newer guns (made since 1985 or so), and is best used sparingly. I will deal here with only commercially available ammunition: there are specialized loads available only to law enforcement personnel. Civilians should not worry, as there are commercial loads as good or better than anything restricted to law enforcement usage.

I will now tell you the best 9mm Luger load for self-defense: it is the Cor-Bon 9mm 115 grain +P Jacketed Hollowpoint. This is the most powerful and street-proven manstopper available in this caliber. It is a high velocity (1340 fps) and high pressure round, and more effective than any load restricted to law enforcement use (such as the Federal 9BPLE).

Unfortunately, it is also likely to jam many older guns. For this reason I add a table at the end of the 9mm section discussing round suitability for different guns. Modern hollowpoints may either (a) jam, or (b) be too powerful for some older guns. This load is suitable only for First Class pistols (see table).

The best standard pressure 9mm load is the Federal 115 grain JHP (9BP). Its effectiveness and accuracy make it the world standard. Buy several boxes. Other excellent standard pressure 9mm loads are the Winchester Silvertip 115 grain (X9MMSHP), and Federal 124 grain Hydra-shok (P9HS1).

For guns that may jam with the Cor-Bon or Federal 115 grain hollow-points, the Remington 115 grain +P JHP is a good choice (R9MM6). For older guns I would use the Remington standard pressure 115 gr. JHP (R9MM1).

Now it is time to impart some crucial information: NEVER use 147 grain ammo in a 9mm pistol! There was a stupid fad for 147 grain hollowpoints a few years ago, and many were suckered into buying these weak, worthless and malfunction-prone rounds. I don't care what you've heard: never use any 9mm hollowpoint heavier than 125 grains. 147 grain hollowpoints often jam in many popular 9mm guns like the Browning Hi-Power, SIG, Beretta 92, S&W and Glock. Ignore the gun magazine hype and stick to what works. If you want to gamble, go to Reno. Don't gamble with your life. 147 grain ammo sucks.

(Note: just because your pistol appears in Class 3, say, doesn't mean it is unreliable: it may indeed feed hollowpoints. But you must fire at least 200 rounds of your chosen JHP carry load to determine if your pistol will feed them properly. I have placed pistols in each category according to reputation and experience. These are only meant as guidelines - your pistol may feed JHP rounds better - or worse - than this table indicates)

First Class pistols are ultra-reliable and high-quality new guns than can feed any hollowpoint and tolerate +P loads with no problems: SIG/Sauer P220 series. Czech CZ75 and CZ85. Walther P5, P5C, and P88. Heckler and Koch USP and P7 series. All Glocks. All Ruger 9mm pistols. Taurus PT-99, PT-92 and PT-92C. Steyr GB. Beretta 92 series. Browning BDM and Hi-Power (if it says "Portugal" on the slide). All Smith & Wessons with a four-digit model number (e.g. 5906, 3913, 6904, 5903) and the Smith & Wesson 900 series. Star M28, M30, M31, and all Firestars, Megastars, and Ultrastars.

The 9 mm is the world's most popular pistol cartridge. In FMJ, with a one shot stopping success of only 63%, the 9 mm is not a superlative manstopper. Use ball ammunition for practice only. Use JHP for self defense.

The 9 mm cartridge exhibits penetration of 10 to 12 inches.

Ammunition for the 9 mm is available in three pressure classes: standard pressure, high pressure "+P", and ultra high pressure "+P+". High and ultra high pressure rounds should be used only in newer handguns manufactured since approximately 1985. It is best to use this ammunition sparingly.

The most powerful high pressure round, the Cor-Bon +P, JHP, 115 grains, is the best cartridge in 9 mm for self defense use due to its proven performance in real world aggressive encounters. In older guns, however, it may either not cycle properly or be too powerful. The best standard pressure cartridges are the Federal "Nyclad", LHP, 124 grains, and 115 grain, JHP ammunition produced by any of the top five manufacturers.

For modern guns that may jam with the Cor-Bon or Federal JHP, the Remington +P, JHP, 115 grains, may be a reliable alternative. The standard pressure Remington JHP, 115 grains, is well suited for use in most older guns.

For optimum performance, it is recommended that one not use any 9 mm JHP or LHP ammunition that is heavier than 124 grains.

The foregoing guidelines regarding ammunition selection for various makes and models of 9 mm pistols are based on the generalized reputation and performance of these particular firearms. To see if a particular pistol will reliably feed JHP ammunition, it is advisable to fire at least 200 rounds of a selected JHP cartridge to properly ascertain a pistol's ability to properly cycle that round.

It seems a little dated though, because there is no mention of Speer Gold Dots, which is THE #1 used Law enforcement ammo on the market today and with a great reputation.
Works flawlessly in my Sig.

I may just pick up some Sellier 9mm SPs and try them for the fun of it but load the Speer at night.
Selliers 30-06 Barnes & Sierra Bullet loads looked excellent for big game and might get myself a box or 2 or that also._________________Real men hunt Wire Dogs